Method of and apparatus for winding a web of material

ABSTRACT

METHOD OF CNTINUOUSLY WINDING A WEB OF SHEET MATERIAL, SUCH AS PLASTIC FILM ONTO A WINDUP ROLL INCLUDING THE STEP OF FORCING AIR FROM BETWEEN THE LAYERS OF THE WB AS IT IS WOUND BY SELECTIVELY PRESSING THE WEB AGAINST THE WINDUP ROLL WITH A PRESSURE ROLL HAVING A PREDETERMINED SOLID AREA DEFINING OPEN AREAS THEREBETWEEN WHEREBY A PREDETERMINED AMOUNT OF AIR IS LEFT BETWEEN THE LAYERS TO CONTROL THE HARDNESS OF THE WOUND ROLL. APPARATUS IS PROVIDED FOR PERFORMING THIS METHOD OF WINDING. IN SUCH APPARATUS, THE OPEN SURFACE AREAS OF THE CONTACT ROLL GENERALLY CONSTITUTE FROM 5% TO 65% OF THE   TOTAL SURFACE AREA OF SUCH ROLL AND, PREFERABLY, FROM 30% TO 36% THEREOF.

DEFENSIVE PULICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The dies of these applications are available to the publicfor inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. ThePatent Oiiice makes no assertion as to the novelty of the disclosed subject matter;

PUBLISHED AUGUST 15, 1972 T901,029 METHOD OF AND APPARATUS FOR WINDING A WEB 0F MATERIAL Gordon W. Thompson, Clinton, Iowa, assignor to E. I.

du Pont de Nemours and Company, Wilmington, Del. Continuation of application Ser. No. 814,711, Apr. 9,

1969. This application May 6, 1971, Ser. No. 140,982

lint. Cl. B6511 23/16 [1.8. Cl. 24255 1 Sheet Drawing. 11 Pages Specification Method of continuously winding a web of sheet material, such as plastic film onto a windup roll including the step of forcing air from between the layers of the web as it is wound by selectively pressing the web against the windup roll with a pressure roll having a predetermined solid area defining open areas therebetween whereby a predetermined amount of air is left between the layers to control the hardness of the wound roll.

Apparatus is provided for performing this method of winding. In such apparatus, the open surface areas of the contact roll generally constitute from 5% to 65% of the total surface area of such roll and, preferably, from 30% to 36% thereof.

Ange 197 a. w. THOMPSON METHOD OF AND APPARATUS FOR WINDING A WEB OF MATERIAL Original Filed April 9 L969 INVENTOR GORDON W. THOMPSON ATTORNEY 

